Add a simpler key type for scratch resource keys.

src/gpu/GrPathRange.h

Index: src/gpu/GrPathRange.h
diff --git a/src/gpu/GrPathRange.h b/src/gpu/GrPathRange.h
index a1431b93c768b6598d38ecbd162800286c1d62ab..014b7ece74caa597ce044b984f0b3882e8978663 100644
--- a/src/gpu/GrPathRange.h
+++ b/src/gpu/GrPathRange.h
@@ -28,14 +28,6 @@ public:
 
     static const bool kIsWrapped = false;
 
-    /**
-     * Return the resourceType intended for cache lookups involving GrPathRange.
-     */
-    static GrResourceKey::ResourceType resourceType() {
-        static const GrResourceKey::ResourceType type = GrResourceKey::GenerateResourceType();
-        return type;
-    }
-
     enum PathIndexType {
         kU8_PathIndexType,   //!< uint8_t
         kU16_PathIndexType,  //!< uint16_t